Hey guys. I'm running an 1810 Nautic Star bay boat with a 115 Yamaha 4 stroke. I cruise at about 35 mph and WOT is approx. 41 mph. I've seen posts on the Nautic Star facebook of others running the same boat (one guy had a Suziki 4 stroke vs. Yamaha) and they claim they achieve WOT of over 50 mph. Although I'm not very concerned about the speed, I'm wondering if I would be able to get better mileage with a different prop. Yamaha performance bulletins only available for this boat with a 90 four stroke. I believe my prop is 13 X 19. Any input is appreciated.